What are flood studies that do not identify BFEs called?

Flood studies that do not identify Base Flood Elevations (BFEs) are referred to as approximate studies. These studies are conducted to assess flood risk areas without the detailed hydrological and hydraulic analyses that would result in specific BFEs.

Approximate studies typically use a less rigorous methodology than detailed studies, which do provide BFEs. In situations where detailed data is unavailable or where a more rapid evaluation of flood risk is needed, approximate studies can still inform land use and development decisions in flood-prone areas.

Understanding the distinction between detailed and approximate studies is essential in floodplain management, as it affects how communities prepare for and respond to potential flood risks. Communities often utilize the information from approximate studies to designate flood hazard zones, even if specific elevation data is not available. Thus, the terminology is critical in the context of floodplain regulations and management practices.